/*
 * Our own header, to be included before all standard system headers.
 */
#ifndef _APUE_H
#define _APUE_H

#define _POSIX_C_SOURCE 200809L

#if defined(SOLARIS)        /* Solaris 10 */
#define _XOPEN_SOURCE 600
#else
#define _XOPEN_SOURCE 700
#endif

#include <sys/types.h>      /* some system still require this */
#include <sys/stat.h>
#include <sys/termios.h>    /* for winsize */

#if defined(MACOS) || !defined(TIOCGWINSZ)
#include <sys/ioctl.h>
#endif

#include <stdio.h>          /* for convenience */
#include <stdlib.h>         /* for convenience */
#include <stddef.h>         /* for offsetof */
#include <string.h>         /* for convenience */
#include <unistd.h>
#include <signal.h>
#include <fcntl.h>

#define MAXLINE 4096 /* max line length */

/*
 * Default file access permission for new files.
 */
#define FILE_MODE (S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH)

/*
 * Default permissions for new directories.
 */
#define DIR_MODE (FILE_MODE | S_IXUSR | S_IXGRP | S_IXOTH)

typedef void Sigfunc(int); /* for singnal handlers */

#if defined(SIG_IGN) && !defined(SIG_ERR)
#define SIG_ERR ((Sigfunc *)-1)
#endif

#define min(a, b)  ((a) < (b) ? (a) : (b))
#define max(a, b)  ((a) > (b) ? (a) : (b))

/*
 * Prototypes for our own functions.
 */
char    *path_alloc(size_t *);                                /* Figure 2.16 */
long     open_max(void);                                      /* Figure 2.17 */

int      set_cloexec(int);                                    /* Figure 13.9 */
void     clr_fl(int, int);
void     set_fl(int, int);

void     pr_exit(int);                                        /* Figure 3.12 */

void     pr_mask(const char *);                               /* Figure 10.14 */
Sigfunc *signal_intr(int, Sigfunc *);                         /* Figure 10.19 */

void     daemonize(const char *);                             /* Figure 13.1 */

void     sleep_us(unsigned int);                              /* Exercise 14.5 */
ssize_t  readn(int, void*, size_t);                           /* Figure 14.24 */
ssize_t  writen(int, const void*, size_t);                    /* Figure 14.24 */

int      fd_pipe(int *);                                      /* Figure 17.2 */
int      recv_fd(int, ssize_t (*func)(int,
            const void *, size_t));                           /* Figure 17.14 */
int      send_fd(int, int);                                   /* Figure 17.13 */
int      send_err(int, int, const char *);                    /* Figure 17.12 */
int      serv_listen(const char *);                           /* Figure 17.8 */
int      serv_accept(int, uid_t *);                           /* Figure 17.9 */
int      cli_conn(const char *);                              /* Figure 17.10 */
int      buf_args(char *, int (*func)(int,
                  char **));                                  /* Figure 17.23 */

int      tty_cbread(int);                                     /* Figure 17.20 */
int      tty_raw(int);                                        /* Figure 17.20 */
int      tty_reset(int);                                      /* Figure 17.20 */
void     tty_atexit(void);                                    /* Figure 17.20 */
struct termios *tty_termios(void);                            /* Figure 17.20 */

int      ptym_open(char *, int);                              /* Figure 19.9 */
int      ptys_open(char *);                                   /* Figure 19.9 */
#ifdef TIOCGWINSZ
pid_t    pty_fork(int *, char *, int, const struct termios *,
                  const struct winsize *);                    /* Figure 19.10 */
#endif

int      lock_reg(int, int, int, off_t, int, off_t);          /* Figure 14.5 */

#define  read_lock(fd, offset, whence, len) \
             lock_reg((fd), F_SETLK, F_RDLCK, (offset), (whence), (len))
#define  readw_lock(fd, offset, whence, len) \
             lock_reg((fd), F_SETLKW, F_RDLCK, (offset), (whence), (len))
#define  write_lock(fd, offset, whence, len) \
             lock_reg((fd), F_SETLK, F_WRLCK, (offset), (whence), (len))
#define  writew_lock(fd, offset, whence, len) \
             lock_reg((fd), F_SETLKW, F_WRLCK, (offset), (whence), (len)) 
#define  un_lock(fd, offset, whence, len) \
             lock_reg((fd), F_SETLK, F_UNLCK, (offset), (whence), (len))

pid_t lock_test(int, int, off_t, int, off_t);                 /* Figure 14.6 */

#define  is_read_lockable(fd, offset, whence, len) \
             (lock_test((fd), F_RDLCK, (offset), (whence), (len)) == 0)
#define  is_write_lockable(fd, offset, whence, len) \
             (lock_test((fd), F_WRLCK, (offset), (whence), (len)) == 0)

void     err_msg(const char *, ...); /* Appendix B */
void     err_dump(const char *, ...) __attribute__((noreturn));
void     err_quit(const char *, ...) __attribute__((noreturn));
void     err_cont(int, const char *, ...);
void     err_exit(int, const char *, ...) __attribute__((noreturn));
void     err_ret(const char *, ...);
void     err_sys(const char *, ...) __attribute__((noreturn));

void     log_msg(const char *, ...); /* Appendix B */
void     log_open(const char *, int, int);
void     log_quit(const char *, ...) __attribute__((noreturn));
void     log_ret(const char *, ...);
void     log_sys(const char *, ...) __attribute__((noreturn));
void     log_exit(int, const char *, ...) __attribute__((noreturn));

void     TELL_WAIT(void); /* parent/child from Section 8.9 */
void     TELL_PARENT(pid_t);
void     TELL_CHILD(pid_t);
void     WAIT_PARENT(void);
void     WAIT_CHILD(void);

#endif /* _APUE_H */
